+/*
+ * ldap_int_utils_init() should be called before any other function.
+ */
+
+void ldap_int_utils_init( void )
+{
+ static int done=0;
+ if (done)
+ return;
+ done=1;
+
+#ifdef LDAP_R_COMPILE
+
+#if !defined( USE_CTIME_R ) && !defined( HAVE_REENTRANT_FUNCTIONS )
+ ldap_pvt_thread_mutex_init( &ldap_int_ctime_mutex );
+#endif
+
+#if !defined( HAVE_GETHOSTBYNAME_R ) || !defined( HAVE_GETHOSTBYADDR_R )
+ ldap_pvt_thread_mutex_init( &ldap_int_gethostby_mutex );
+#endif
+
+#ifdef HAVE_RES_QUERY
+ ldap_pvt_thread_mutex_init( &ldap_int_resolv_mutex );
+#endif
+
+ /* call other module init functions here... */
+#endif
+}
+
+#if defined( NEED_COPY_HOSTENT )
+# undef NEED_SAFE_REALLOC
+#define NEED_SAFE_REALLOC
+
+static char *cpy_aliases( char ***tgtio, char *buf, char **src )
+{
+ int len;
+ char **tgt=*tgtio;
+ for( ; (*src) ; src++ ) {
+ len = strlen( *src ) + 1;
+ AC_MEMCPY( buf, *src, len );
+ *tgt++=buf;
+ buf+=len;
+ }
+ *tgtio=tgt;
+ return buf;
+}
+
+static char *cpy_addresses( char ***tgtio, char *buf, char **src, int len )
+{
+ char **tgt=*tgtio;
+ for( ; (*src) ; src++ ) {
+ AC_MEMCPY( buf, *src, len );
+ *tgt++=buf;
+ buf+=len;
+ }
+ *tgtio=tgt;
+ return buf;
+}
+
+static int copy_hostent( struct hostent *res, char **buf, struct hostent * src )
+{
+ char **p;
+ char **tp;
+ char *tbuf;
+ int name_len;
+ int n_alias=0;
+ int total_alias_len=0;
+ int n_addr=0;
+ int total_addr_len;
+ int total_len;
+
+ /* calculate the size needed for the buffer */
+ name_len = strlen( src->h_name ) + 1;
+
+ if( src->h_aliases != NULL ) {
+ for( p = src->h_aliases; (*p) != NULL; p++ ) {
+ total_alias_len += strlen( *p ) + 1;
+ n_alias++;
+ }
+ }
+
+ if( src->h_addr_list != NULL ) {
+ for( p = src->h_addr_list; (*p) != NULL; p++ ) {
+ n_addr++;
+ }
+ total_addr_len = n_addr * src->h_length;
+ }
+
+ total_len = (n_alias + n_addr + 2) * sizeof( char * ) +
+ total_addr_len + total_alias_len + name_len;
+
+ if (safe_realloc( buf, total_len )) {
+ tp = (char **) *buf;
+ tbuf = *buf + (n_alias + n_addr + 2) * sizeof( char * );
+ AC_MEMCPY( res, src, sizeof( struct hostent ) );
+ /* first the name... */
+ AC_MEMCPY( tbuf, src->h_name, name_len );
+ res->h_name = tbuf; tbuf+=name_len;
+ /* now the aliases */
+ res->h_aliases = tp;
+ if ( src->h_aliases != NULL ) {
+ tbuf = cpy_aliases( &tp, tbuf, src->h_aliases );
+ }
+ *tp++=NULL;
+ /* finally the addresses */
+ res->h_addr_list = tp;
+ if ( src->h_addr_list != NULL ) {
+ tbuf = cpy_addresses( &tp, tbuf, src->h_addr_list, src->h_length );
+ }
+ *tp++=NULL;
+ return 0;
+ }
+ return -1;
+}
+#endif
+
+#if defined( NEED_SAFE_REALLOC )
+static char *safe_realloc( char **buf, int len )
+{
+ char *tmpbuf;
+ tmpbuf = LDAP_REALLOC( *buf, len );
+ if (tmpbuf) {
+ *buf=tmpbuf;
+ }
+ return tmpbuf;
+}
+#endif
+
+char * ldap_pvt_get_fqdn( char *name )
+{
+ char *fqdn, *ha_buf;
+ char hostbuf[MAXHOSTNAMELEN+1];
+ struct hostent *hp, he_buf;
+ int rc, local_h_errno;
+
+ if( name == NULL ) {
+ if( gethostname( hostbuf, MAXHOSTNAMELEN ) == 0 ) {
+ hostbuf[MAXHOSTNAMELEN] = '\0';
+ name = hostbuf;
+ } else {
+ name = "localhost";
+ }
+ }
+
+ rc = ldap_pvt_gethostbyname_a( name,
+ &he_buf, &ha_buf, &hp, &local_h_errno );
+
+ if( rc < 0 || hp == NULL || hp->h_name == NULL ) {
+ fqdn = LDAP_STRDUP( name );
+ } else {
+ fqdn = LDAP_STRDUP( hp->h_name );
+ }
+
+ LDAP_FREE( ha_buf );
+ return fqdn;
+}
+
+#if defined( HAVE_GETADDRINFO ) && !defined( HAVE_GAI_STRERROR )
+char *ldap_pvt_gai_strerror (int code) {
+ static struct {
+ int code;
+ const char *msg;
+ } values[] = {
+#ifdef EAI_ADDRFAMILY
+ { EAI_ADDRFAMILY, "Address family for hostname not supported" },
+#endif
+ { EAI_AGAIN, "Temporary failure in name resolution" },
+ { EAI_BADFLAGS, "Bad value for ai_flags" },
+ { EAI_FAIL, "Non-recoverable failure in name resolution" },
+ { EAI_FAMILY, "ai_family not supported" },
+ { EAI_MEMORY, "Memory allocation failure" },
+#ifdef EAI_NODATA
+ { EAI_NODATA, "No address associated with hostname" },
+#endif
+ { EAI_NONAME, "Name or service not known" },
+ { EAI_SERVICE, "Servname not supported for ai_socktype" },
+ { EAI_SOCKTYPE, "ai_socktype not supported" },
+ { EAI_SYSTEM, "System error" },
+ { 0, NULL }
+ };
+
+ int i;
+
+ for ( i = 0; values[i].msg != NULL; i++ ) {
+ if ( values[i].code == code ) {
+ return (char *) values[i].msg;
+ }
+ }
+
+ return "Unknown error";
+}
+#endif